ml.shifu.guagua.master
类 AbstractMasterCoordinator.MasterElectionCommand

java.lang.Object
  ml.shifu.guagua.BasicCoordinator.BasicCoordinatorCommand
      ml.shifu.guagua.master.AbstractMasterCoordinator.MasterElectionCommand

所有已实现的接口：

BasicCoordinator.CoordinatorCommand

包容类：

AbstractMasterCoordinator<MASTER_RESULT extends Bytable,WORKER_RESULT extends Bytable>

protected class AbstractMasterCoordinator.MasterElectionCommand
extends BasicCoordinator.BasicCoordinatorCommand

Elect master from several backup masters.

Wait until it is the first bid, then it is elected as master.

Since fail-over in hadop map-reduce tasks is very fast. Using multiple-master is not a good choice expecially time out is too large.

Multiple masters are used in environment in which no fail-over.

构造方法摘要

AbstractMasterCoordinator.MasterElectionCommand(String appId)

方法摘要

void	doExecute() Real method to do coordinator operation.

从类 ml.shifu.guagua.BasicCoordinator.BasicCoordinatorCommand 继承的方法

execute

从类 java.lang.Object 继承的方法

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造方法详细信息

AbstractMasterCoordinator.MasterElectionCommand

public AbstractMasterCoordinator.MasterElectionCommand(String appId)

方法详细信息

doExecute

public void doExecute()
               throws org.apache.zookeeper.KeeperException,
                      InterruptedException

从类 BasicCoordinator.BasicCoordinatorCommand 复制的描述

Real method to do coordinator operation.

指定者：

类 BasicCoordinator.BasicCoordinatorCommand 中的 doExecute

抛出：

org.apache.zookeeper.KeeperException

InterruptedException